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EP0451342A2
Expired / Lapsed
EP
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Radio receiver with two receiving systems
Assignee: Pioneer Corp
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Filing: 1990-11-26
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Granted: —
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Expires: 2010-11-26
Abstract
Abstract A radio receiver with two receiving systems includes a CPU for selecting the appropriate ranges of local signal generators in the two receiving systems so that local signals generated by said local signal generators do not fall into the frequency range of a received RF signal. <IMAGE>
Inventors
- 👤 Tadashi C/O Pioneer Electronic Corp. Kosuga
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 21:38
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/06; H04B1/16; H04B1/1646; H04B7/00; H04B7/02; H04B7/12
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
177 words
A radio receiver apparatus comprising: a first receiver of the double superheterodyne type including a first mixer for applying a first local signal to a received RF signal so as to output a first intermediate frequency signal, a second mixer for applying a second local signal to said first intermediate frequency signal so as to output a second intermediate frequency signal, and a first detector circuit for demodulating said second intermediate frequency signal; and a second receiver of the single superheterodyne type including a third mixer for applying a third local signal to the received RF signal so as to output a third intermediate frequency signal, and a second detector circuit for demodulating said third intermediate frequency signal, wherein a single receiving frequency band is divided into at least two frequency ranges, a first frequency range and a second frequency range, and a demodulated output signal of said first receiver or that of said second receiver is selected by a selecting means depending upon whether said received RF signal is in said first or said second range.
Claim 2
Dependent Claim
16 words
A radio receiver apparatus as claimed in claim 1 wherein said selecting means is a CPU.
Claim 3
Dependent Claim
19 words
A radio receiver apparatus as claimed in claim 2 wherein said selecting means receives an input from a keyboard.
Claim 4
Dependent Claim
17 words
A radio receiver apparatus as claimed in claim 1 wherein said apparatus is a network follow system.
Claim 5
Dependent Claim
114 words
A radio receiver apparatus for avoiding the negative effect of local pilot signals entering the frequency range of a received RF signal, said apparatus comprising: first receiver means for receiving said RF signal said first receiver means including a first local pilot signal generator means for generating a first local pilot signal; second receiver means for also receiving said RF signal said second receiver means including second local pilot signal generator means for generating a second local pilot signal; keyboard means for entering data corresponding to a desired frequency of said RF signal; control means for controlling said first and second local pilot signal generator means based on data entered by said keyboard means.
Claim 6
Dependent Claim
16 words
A radio receiver apparatus as claimed in claim 5 wherein said control means is a CPU.
Claim 7
Dependent Claim
29 words
A radio receiver apparatus as claimed in claim 5 wherein said apparatus further includes a switch means for switching between outputs of said first and said second receiver means.
Claim 8
Dependent Claim
41 words
A radio receiver apparatus as claimed in claim 7 wherein said switch means receives a control signal from said control means so as to tell said switch means whether to output an output of said first or said second receiver means.
Claim 9
Dependent Claim
24 words
A radio receiver apparatus as claimed in claim 8 wherein said control signal is generated based on said desired frequency of said RF signal.
Claim 10
Dependent Claim
40 words
A radio receiver apparatus as claimed in claim 9 wherein an output of said first or said second receiver means that is not selected by said switch means is sent to said control means to perform a network follow operation.
References Cited (Backward Citations)
No citation records indexed.
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